package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * @author hyj
 * @create 2023--09--04
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */

    //TODO 使用七牛云实现文件上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //file是一个临时文件,需要转存到指定位置,否则本次请求完成后临时文件会删除
//        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        //截取后缀.jpg
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //生成UUID随机文件名,防止因为文件名相同被覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()){
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }


    /**
     * 下载文件
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {

        //输入流,通过输入流读取文件内容
        FileInputStream fileInputStream = null;
        try {
            fileInputStream = new FileInputStream(new File(basePath + name));

            //输出流,通过输出流将文件写回浏览器,在浏览器中展示图片
            ServletOutputStream outputStream = response.getOutputStream();

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }


}
